Decimal Addition and Subtraction Unit

Build accurate, confident decimal calculation with a complete Year 6 Mathematics unit for explicit teaching, guided practice, independent application and assessment.

Students learn to align decimal points, use zero placeholders, add and subtract decimals with different numbers of decimal places, round and estimate, check answers with inverse operations and solve practical money and measurement problems. Error analysis, missing-number challenges and reasoning tasks help students explain methods and judge whether answers are reasonable.

The unit combines an editable 18-slide teaching presentation, three printable displays and reference pages, nine focused worksheets, five games and activities, a 22-slide quiz, a three-part assessment, 14 answer pages and a five-level marking rubric. It can be taught as a flexible one-week sequence of approximately 5–8 lessons or used selectively for revision, intervention, homework or assessment preparation.

What's included

Core files

• Decimal Addition and Subtraction Unit Plan.pdf — 37 pages, including one cover and 36 printable resource pages
• Decimal Addition and Subtraction Presentation.pptx — 18 editable teaching slides
• Decimal Addition and Subtraction Quiz.pptx — 22 editable slides with 10 question-and-answer pairs
• Decimal Addition and Subtraction Preview.pdf — 77 combined preview pages/slides

Displays and reference material

• Adding Decimals display
• Subtracting Decimals display
• Decimal Operations Quick Guide

Worksheets

• Align and Add Decimals
• Align and Subtract Decimals
• Adding Lists of Decimals
• Rounding Decimals
• Estimate, Solve and Check
• Canteen Calculator
• Decimal Measurement Problems
• Decimal Detective
• Making Decimal Lists

Games and activities

• Decimal Magic Squares
• Decimal Four in a Row
• Decimal War board and digit cards
• Decimal Dice Duel
• Jungle Decimal Expedition

Assessment

• Part A — Core Skills
• Part B — Applications
• Part C — Reasoning
• Decimal Addition and Subtraction Assessment Rubric with five achievement levels

Answers

• 14 teacher answer pages for the worksheets, applicable activities and all three assessment parts

Learning focus

• Align decimal points and use zero placeholders correctly
• Add and subtract decimals with different place-value lengths
• Estimate before calculating and check whether results are reasonable
• Verify calculations using inverse operations
• Solve decimal problems involving money, length, mass, capacity and time
• Identify calculation errors and communicate mathematical reasoning

Classroom use

Use the presentation for explicit modelling, the displays and quick guide for ongoing reference, the worksheets for guided or independent practice, and the games for partner or small-group consolidation. The quiz provides low-stakes review, while the three-part assessment and rubric support evidence collection and feedback.

File details

Formats: PDF and editable PPTX

Counts: 37-page unit plan, 18-slide presentation and 22-slide quiz; 77-page combined preview

Answer support: 14 answer pages plus a five-level marking rubric

Suggested teaching duration: Approximately 5–8 lessons or sessions

Teacher benefits

• One coherent sequence from explicit instruction to assessment
• Editable presentation and quiz files
• Printable colour displays and low-ink black-and-white practice pages
• Varied individual, partner and small-group tasks
• Complete fixed-response answers and a practical assessment rubric

Digital product and licence

This is a digital product; no physical item will be shipped. Purchase permits use by one teacher in one classroom or by one household. The files may not be redistributed, resold, shared publicly or uploaded to a public website or shared drive.